M2 stylus with 0.5 mm diameter ruby ball, tapered carbide stem, and 3.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.4 mm, and major diameter is 1.0 mm. Stylus length to ball center is 10.0 mm. Stylus weight is 0.31 gram. Compare to Renishaw A-5000-7805, Zeiss 623062-3132-000, Carbide Probes 265-.5R, and Mitutoyo K651276.